File:PSM V70 D236 Forty wire telephone switchboard.png
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![File:PSM V70 D236 Forty wire telephone switchboard.png](https://upload.wikimedia.org/wikipedia/commons/thumb/4/40/PSM_V70_D236_Forty_wire_telephone_switchboard.png/525px-PSM_V70_D236_Forty_wire_telephone_switchboard.png?20111223074435)
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